Handle concurrent editing and styling in Tree

[humdrum]

What this PR does / why we need it:

• Handle concurrent editing and styling in Tree yorkie-js-sdk#803

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Additional documentation:

Checklist:

• Added relevant tests or not required
• Didn't break anything

[codecov]

Codecov Report

Attention: Patch coverage is 36.66667% with 57 lines in your changes are missing coverage. Please review.

Project coverage is 40.87%. Comparing base (bacbf9c) to head (6462d14).

Files	Patch %	Lines
Sources/Document/CRDT/CRDTTree.swift	21.73%	36 Missing ⚠️
Sources/API/V1/yorkie/v1/resources.pb.swift	0.00%	8 Missing ⚠️
Sources/Document/Json/JSONTree.swift	0.00%	5 Missing ⚠️
Sources/API/Converter.swift	0.00%	4 Missing ⚠️
...ources/Document/Operation/TreeSytleOperation.swift	0.00%	3 Missing ⚠️
Sources/Document/CRDT/RGATreeSplit.swift	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
- Coverage   40.95%   40.87%   -0.08%     
==========================================
  Files         105      105              
  Lines       17936    17969      +33     
==========================================
  Hits         7345     7345              
- Misses      10591    10624      +33     

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[myupage]

works well